Sewing-machine



(No Model.) 2 Sheets-Sheet 1.

' D. L. KEEL-ER.

SEWING. MACHINE.

No. 255,633. 8 y Patented Ma. 1*.28,1882.

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(No Model.) 2 Sheets-'Sheet 2.

11L. KEELER.

SEWING MACHINE. "N0. 255,633. Patented Mar. 28, 1882.

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SPECIFICATION forming part of Letters Patent No. 255,633, dated March 28I Application filed July 11, 1881. (No model.) I V To all whom it mayconcern:

Bedt known that I, DAVID L. KEELER, of Grand Rapids, county of Kent,State of Michigan, have invented a new and usefulImprovementinDriveMechanismforSewing-Machines; and I declare thefollowing to be a full, clear, and exact description of the same, suchas will enable Others skilled in the art to which it pertains to makeand use it, reference beinghad to the accompanying drawings, which forma part of this specification.

Myinvention consists in a novel combination of devices for transmittingmotion from the driving-shaft to the feed and shuttle, as will behereinafter particularlydescribed, and pointed out in the claims. 7

In the drawings, Figure 1 is a perspective viewof a portion of the underside of a sewing-machine inverted, showing the connection between thefeedshaft and the shuttle-lever. Fig. 2 is a perspective view of theslidingjournal-box and its casing separated. Fig. 3 is a perspectiveview of a modification of the easting. Fig. 4 is a perspective view of aportion of the shuttle-lever, showing its pivot. Fig. 5 is a View partlyin elevation and partly in sec tion, illustrating the feed devices.

The letter A designates the bed-plate of the machine.

D D is a feed-shaft running longitudinally of the machine. D is a diskat its end; and D a link pivoted eccentrically on the outer face of thedisk, whereby it is connected with the pitman (J.

E is the shuttle-lever, pivofel at E to the bed-plate of the machine.

E is aslotted tubular projection, which embraces and has fitted withinit a sliding journal-box, E which slidingjournal-box receives the crankD in the shaft D. .The sliding box I IE not only has a longitudinalsliding movement in the projection E but a rotary movement in followingthe crank. The projection E may be made adjustable upon theshuttlelever, so as. to provide for an adjustment of the throw of theshuttle. The operation of this part of the mechanism will be nowunderstood. Motion is communicated to the feed-shalt by the pitman G andthe link D As the shaft D revolves its crank D in turning causes theshuttle-lever to oscillate about the pivot E,

DAVID L. KEELER, or GRANDRAPIDS, MICHIGAN.

and the slidingjournal-box E moves with the. crank and slideslongitudinally in the tubular projection E while at the same timesliding,

-and slides longitudinally along the crank, and

thus conforms easily to all the movements of the crank andshuttle-lever.

I will now describe the feeding mechanism. It is the object of this partof my invention to providea feeding device in which the teeth shallalways start from the same point at each stroke, and then for differentlengths of stitch the throw of the teeth is subtracted from the otherend of their stroke. To this end, F is the feed-bar, and F its teeth.projecting down contiguous to the cam or eccentricD I then provide forthe adjustment of the length of stitch by adjusting this arm nearer toor farther from the eccentric without altering in any way the informalposition of the feedbar and its teeth. To accomplish this end I pivotthe arm F to the feed-bar at A connecting-rod, F passes through astationary or swivel nut, F*, by means of which the arm F is adjusted.

5 A machine constructed as above described presents many advantages: Themotion of the drive-shaft is communicated to the feed-shaft by asingle-bar pitman without mechanism of any kind. The shaft D, which isdriven by the pitinan, operates directly the shuttle-lever and the feedby positive movement and, moreover, the feed mechanism, since its teethalways take hold of the goods at the same point with respect to theneedle, it follows that it will operate under precisely the sameconditions for every length of stitch. The structure throughoutisgreatlycheapened and simplified, friction is reduced to a minimum, andthe machine is rendered a very light-running device. 0

To prepare the journal-box for the insertion of the crank, I slot itfrom one end and then, after the crank is inserted, plug it up tightwith leather, rawhide, or its equivalent, 0 Should the sliding boxbecome loose within its bear- 5 ings any of the usual means may beemployed for compensating in the said manner. As, for instance, thewearing-surfaces within the projection E may be in the nature of looseplates 0 which may be ad'usted snu a ainst the 7 J b 3 b sliding box byset-screws e, as shown in the modification Fig. 4. In like manner any ofF is an arm 65 the journals may be provided with the usual means oftake-up lost motion.

What I claim is- 1. The combination, with thefeed-shaft hav- 5 ing crankD and the shuttle-lever provided with the slotted tubular projection Eof the journal-box E embracing said crank and having a sliding movementthereon, and fitted to slide vertically in said tubular projection and10 to permit the same to rock upon-it, substantially as described.

2. The combination, with the feed-bar F, car rying the feed-dog F, ofthe arm F pivoted to said feed-bar, the rod F jointed to said arm F atone end, and having its other end adjustr5 ably secured, the cam D fixedupon the shaft D, and a suitable spring for returning the feed bar afterits forward stroke, all constructed and arranged to operatesubstantially as described.

Intcstimony whereof I sign this specification 20 in the presence of twowitnesses.

DAVID L. KEELER.

Witnesses WMVWOODWARD, ALFRED D. RATHBONE.

